2010 BMW 128i Convertible (E88) L6-3.0L (N52K) P Code Charts
none
P0139
2C7B – P0139
Information saved in
DME
Fault code
2C7B – P0139
Fault text
Oxygen sensor behind catalytic converter, signal
Fault description
O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
Condition for fault identification
Test condition:
78
O2 sensor behind catalytic converter voltage too high with
overrun injection deactivation active; signal sticks at rich
Terminal condition: Terminal 15, engine on
Voltage condition:
none
Condition for fault memory entry
Voltage > 0.2 V
Action in service
1. Check wiring
2. Check plugs
3. Measure wire resistance against positive and ground
4. Replace Bank 1 downstream (post-cat) O2 sensor
Fault effect and breakdown warning
